Hi, I had to face the same problem not connecting to DNS due to ESP8266 not getting a proper IP address. Normally all router provides IP address ranges from 192.168.1.xx to 192.168.1.xx. But android mobile hotspot provides ranges from 192.168.43.xx I had ser according to that IP address was 192.168....

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Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. We are the manufacturer of ESP8266EX.